摘要
以钛酸四丁酯为前驱物,采用溶胶-凝胶法制备了四种不同配方Eu3+掺杂的TiO2纳米晶.利用扫描电镜(SEM)、EDS能谱、光致发光光谱对样品的形貌、成份及性能进行了表征.研究了退火温度、稀土Eu3+离子掺杂摩尔分数、溶剂乙醇量等对发光性能的影响,并对其发光机理进行了探讨.结果表明:稀土Eu3+掺杂TiO2纳米晶样品,掺杂均匀、颗粒大约在30～80nm;从EDS能谱分析可得Ti:O原子个数比并不是按化学计量TiO2满足1:2,这是因为在TiO2中形成的是Ti-O-Ti键,Eu3+离子很可能取代了Ti4+离子,同时又形成了氧空位,表明稀土Eu3+离子进入TiO2晶格中;样品的主发射峰在614nm(5D0→7F2)处发光最强,且在593nm(5D0→7F1)处出现了属于磁偶极跃迁的发射峰,制备Eu3+∶TiO2纳米晶的组分、退火温度、溶剂乙醇的量不同,发射光谱的强度也不同.
Four different formulas of the Eu^3＋ doped TiO2 nano-crystals are prepared by the sol-gel method,using tetrabutyl titanate as the precursor. The morphology,composition and properties of the luminous samples are characterized by the SEM,EDS and PL spectra. And also the effects and mechanism of annealing temperature,mole fraction of the Eu^3＋ ions doped and the quantity of ethanol on the luminous intensity are analyzed respectively. The results show that the samples are homogeneusly doping,and the particle size is about 30~80 nm. The EDS spectra show that the Ti∶O atomic ratio is not based on the number of stoichiometric TiO2 to meet the ratio 1∶2,for the formation of Ti-O-Ti bond in TiO2,Eu3 ＋ is likely to replace the Ti4＋,at the same time the oxygen vacancies is formed,which indicates that the rare earth of Eu^3＋ entered into TiO2 lattices. The PL spectra of nano-crystal TiO2∶Eu^3＋ show the strongest red emission intensity at 614 nm（5D0→7F2）,simultaneously,the sample emission peak at 593 nm（5D0→7F1）,which is classified to the magnetic dipole transition. In addition,annealing temperature and the quantity of ethanol have important effects on the emission intensity.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2010年第9期1547-1552,共6页
Acta Photonica Sinica
基金
国家自然科学基金(20876125)
西北大学研究生创新教育项目(08YSY02
09YJC27)资助
关键词
纳米晶
稀土掺杂
溶胶-凝胶技术
能量传递
晶格
Nanocrystalline
Rare earthdoped
Sol-gel technology
Energy transfer
Lattice
